/*
Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.

Note:

The solution set must not contain duplicate triplets.

Example:

Given array nums = [-1, 0, 1, 2, -1, -4],

A solution set is:
[
  [-1, 0, 1],
  [-1, -1, 2]
]

来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/3sum
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。
*/

class Solution {
public:
    vector<vector<int>> threeSum(vector<int>& nums) {
        
    }
};